Crystalline nanobelts of α-MoO3 have been obtained successfully using novel and safe agents through a simple and safe solâgel method (polymerizingâcomplexing) and characterized by XRD, FT-IR, Raman spectroscopies, high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM) and the temperature programmed desorption (TPD) of ammonia. An orthorhombic lattice system for nano-MoO3 was established. The HRTEM images showed that the nanobelt morphology of α-MoO3 mostly ranged from 20â70 nm in width and 200â400 nm in length. The ammonia TPD profile demonstrated strong acidic sites. The spectral and analysis data confirmed the effectiveness of the method for the preparation of α-MoO3 nanobelts by prevention of grain growth or agglomeration of the particles. The nanostructured MoO3 exhibited a high efficiency in catalyzing the condensation reaction of various 1,2-diamine and carbonyl compounds for synthesis of heterocyclic compounds. The recovery of the title heterogenous nanocatalyst was easy and efficient and its catalytic activity was strikingly different from the bulk material.
成功利用新颖且安全的试剂,通过简单安全的溶胶-凝胶法(聚合-络合)获取了α-
MoO3的晶态纳米带,并通过XRD、FT-IR、拉曼光谱、高分辨率透射电子显微镜(HR
TEM)、扫描电子显微镜(
SEM)及
氨的程序升温脱附(
TPD)进行了表征。建立了纳米-
MoO3的正交晶格体系。HR
TEM图像显示α-
MoO3的纳米带形态宽度多在20-70纳米之间,长度为200-400纳米。
氨TPD谱图表明存在强酸性位点。光谱和分析数据确认了该方法在防止颗粒的晶粒生长或聚集方面对于制备α-
MoO3纳米带的有效性。纳米结构的
MoO3在催化多种1,2-二胺和羰基化合物缩合反应合成
杂环化合物方面表现出高效能。该异质纳米催化剂的回收简单高效,其催化活性与块体材料显著不同。